The narrowest street in Paris.

A swath of France so devastated by war it is still forbidden to go there.

A self-built mosaic house and sculpture park.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

The world's largest reflecting pool is just two centimeters deep.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Ghosts of France's colonial past.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

An aluminum skeleton brings Chinese mythology to the French shore.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Avant garde house of Pierre Cardin on the Cote d’Azur.

The fantastic architectural models of a French traveler.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

One of the greatest maze designer’s greatest mazes.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Paris' linguistic guide to the international language of, yes, love.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This massive library holds what was once the largest book collection in the world.